def isprime(number):
    for i in range(2, number):
            if number % i == 0:
                        return False
                            return True


                            primes = [i for i in range(100, 1000) if isprime(i)]
                            s = {
                                    "zero": 0,
                                        "one": 1,
                                            "two": 2,
                                                "three": 3,
                                                    "four": 4,
                                                        "five": 5,
                                                            "six": 6,
                                                                "seven": 7,
                                                                    "eight": 8,
                                                                        "nine": 9,
                            }
                            t = input().split()
                            try:
                                l = s[t[0]] * 100 + s[t[1]] * 10 + s[t[2]]
                                    r = 1000
                                        z = 0
                                            for e in primes:
                                                    if abs(e - l) < k:
                                                                k = abs(e - l)
                                                                            z = e
                                                                                print(z)
                                                                                except:
                                                                                    print("Wrong input")
                            }
